Material sets

Abstract

The present disclosure is drawn to material sets for 3-dimensional printing, 3-dimensional printing systems, and 3-dimensional printed parts. A material set can include a polyamide polymer powder having an average particle size from 20 μm to 120 μm and a fusing agent. The polyamide-11 can have a solution viscosity from 1.5 to 1.75 at room temperature, and may increase by no more than 5% after exposure to 180° C. for 20 hours. The fusing agent can include an energy absorber capable of absorbing electromagnetic radiation to produce heat.

What is claimed is: 
     
       1. A material set, comprising:
 a powder bed material, including a polyamide-11 powder having a D50 particle size from 35 μm to 65 μm and a solution viscosity from 1.5 to 1.75 at room temperature; and 
 a fusing agent comprising an energy absorber capable of absorbing electromagnetic radiation to produce heat. 
 
     
     
       2. The material set of  claim 1 , wherein the solution viscosity changes no more than 5% when exposed to 180° C. for 20 hours in air. 
     
     
       3. The material set of  claim 1 , wherein the powder bed material has a yellow index value of less than about 10 as a virgin powder, and the yellow index value increases to no greater than 40 when exposed to 180° C. for 20 hours in air. 
     
     
       4. The material set of  claim 1 , the polyamide-11 powder has a D10 particle size from 15 μm to 45 μm, and a D90 particle size from 65 μm to 95 μm. 
     
     
       5. The material set of  claim 1 , wherein the energy absorber comprises a carbon black pigment, a near-infrared absorbing dye, a near-infrared absorbing pigment, a tungsten bronze, a molybdenum bronze, metal nanoparticles, or a conjugated polymer, or a combination thereof. 
     
     
       6. The material set of  claim 1 , wherein the powder bed material further includes an anti-oxidant powder admixed with the polyamide-11 powder. 
     
     
       7. A 3-dimensional printing system, comprising:
 a powder bed with a powder bed material including a polyamide-11 powder having a D50 particle size from 35 μm to 65 μm and a solution viscosity from 1.5 to 1.75 at room temperature; 
 a fluid jet printer comprising a fluid jet pen in communication with a reservoir of a fusing agent to print the fusing agent onto the powder bed, wherein the fusing agent comprises an energy absorber capable of absorbing electromagnetic radiation to produce heat; and 
 a fusing electromagnetic radiation source to expose the powder bed material to electromagnetic radiation sufficient to fuse polyamide-11 powder that has been printed with the fusing agent, but which does not fuse the polyamide-11 powder not printed with the fusing agent. 
 
     
     
       8. The system of  claim 7 , wherein the solution viscosity changes no more than 5% when exposed to 180° C. for 20 hours, or wherein the powder bed material has a yellow index value of less than about 10 as a virgin powder and the yellow index value increases to no greater than 40 when exposed to 180° C. for 20 hours in air. 
     
     
       9. The system of  claim 7 , wherein the polyamide-11 powder has a D10 particle size from 15 μm to 45 μm, and a D90 particle size from 65 μm to 95 μm. 
     
     
       10. The system of  claim 7 , wherein the powder bed material further includes an anti-oxidant powder admixed with the polyamide-11 powder. 
     
     
       11. The system of  claim 7 , wherein the energy absorber comprises a carbon black, a near-infrared absorbing dye, a near-infrared absorbing pigment, a tungsten bronze, a molybdenum bronze, metal nanoparticles, or a conjugated polymer, or a combination thereof. 
     
     
       12. A 3-dimensional printed part, comprising a part body comprising multiple layers of energy absorber and powder bed material fused together at individual layer thicknesses from 20 μm to 150 μm, wherein the powder bed material used to prepare the printed part includes a polyamide-11 powder having a D50 particle size from 35 μm to 65 μm and a solution viscosity from 1.5 to 1.75 at room temperature. 
     
     
       13. The 3-dimensional printed part of  claim 12 , wherein the solution viscosity changes no more than 5% when exposed to 180° C. for 20 hours. 
     
     
       14. The 3-dimensional printed part of  claim 12 , wherein the energy absorber includes carbon black pigment, near-infrared absorbing dye, near-infrared absorbing pigment, tungsten bronze, molybdenum bronze, metal nanoparticles, conjugated polymer, or combination thereof. 
     
     
       15. The 3-dimensional printed part of  claim 12 , wherein the X-Y axis and the Z axis elongation is from 20% to 80%, the tensile strength in both X-Y axis and Z axis is from 40 MPa to 60 MPa, and the tensile modulus in both X-Y axis and Z axis is from 1300 MPa to 2100 MPa. 
     
     
       16. The 3-dimensional printed part of  claim 12 , wherein the powder bed material has a yellow index value of less than about 10 as a virgin powder and the yellow index value increases to no greater than 40 when exposed to 180° C. for 20 hours in air. 
     
     
       17. The material set of  claim 1 , wherein the polyamide-11 powder has a solution viscosity from 1.5 to 1.65 at room temperature. 
     
     
       18. The material set of  claim 1 , wherein the polyamide-11 powder has a melting point from about 195° C. to about 203° C. 
     
     
       19. The system of  claim 7 , wherein the polyamide-11 powder has a solution viscosity from 1.5 to 1.65 at room temperature. 
     
     
       20. The system of  claim 7 , wherein the polyamide-11 powder has a melting point from about 195° C. to about 203° C.